{"id":"CVE-2025-21653","revision":null,"records":[{"revision":"29922070ab1a4567b272c0349de3f75c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21653","aliases":[],"title":"net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute\n\nsyzbot found that TCA_FLOW_RSHIFT attribute was not validated.\nRight shitfing a 32bit integer is undefined for large shift values.\n\nUBSAN: shift-out-of-bounds in net/sched/cls_flow.c:329:23\nshift exponent 9445 is too large for 32-bit type 'u32' (aka 'unsigned int')\nCPU: 1 UID: 0 PID: 54 Comm: kworker/u8:3 Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nWorkqueue: ipv6_addrconf addrconf_dad_work\nCall Trace:\n \n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n ubsan_epilogue lib/ubsan.c:231 [inline]\n __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468\n flow_classify+0x24d5/0x25b0 net/sched/cls_flow.c:329\n tc_classify include/net/tc_wrapper.h:197 [inline]\n __tcf_classify net/sched/cls_api.c:1771 [inline]\n tcf_classify+0x420/0x1160 net/sched/cls_api.c:1867\n sfb_classify net/sched/sch_sfb.c:260 [inline]\n sfb_enqueue+0x3ad/0x18b0 net/sched/sch_sfb.c:318\n dev_qdisc_enqueue+0x4b/0x290 net/core/dev.c:3793\n __dev_xmit_skb net/core/dev.c:3889 [inline]\n __dev_queue_xmit+0xf0e/0x3f50 net/core/dev.c:4400\n dev_queue_xmit include/linux/netdevice.h:3168 [inline]\n neigh_hh_output include/net/neighbour.h:523 [inline]\n neigh_output include/net/neighbour.h:537 [inline]\n ip_finish_output2+0xd41/0x1390 net/ipv4/ip_output.c:236\n iptunnel_xmit+0x55d/0x9b0 net/ipv4/ip_tunnel_core.c:82\n udp_tunnel_xmit_skb+0x262/0x3b0 net/ipv4/udp_tunnel_core.c:173\n geneve_xmit_skb drivers/net/geneve.c:916 [inline]\n geneve_xmit+0x21dc/0x2d00 drivers/net/geneve.c:1039\n __netdev_start_xmit include/linux/netdevice.h:5002 [inline]\n netdev_start_xmit include/linux/netdevice.h:5011 [inline]\n xmit_one net/core/dev.c:3590 [inline]\n dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3606\n __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4434","state":0,"publishedAt":"2025-01-19T10:18:10.354+00:00","modifiedAt":"2026-10-15T01:02:49.719+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/sched/cls_flow.c\"\n ],\n \"versions\": [\n {\n \"version\": \"e5dfb815181fcb186d6080ac3a091eadff2d98fe\",\n \"lessThan\": \"9858f4afeb2e59506e714176bd3e135539a3eeec\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e5dfb815181fcb186d6080ac3a091eadff2d98fe\",\n \"lessThan\": \"43658e4a5f2770ad94e93362885ff51c10cf3179\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e5dfb815181fcb186d6080ac3a091eadff2d98fe\",\n \"lessThan\": \"a313d6e6d5f3a631cae5a241c392c28868aa5c5e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e5dfb815181fcb186d6080ac3a091eadff2d98fe\",\n \"lessThan\": \"2011749ca96460386844dfc7e0fde53ebee96f3c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e5dfb815181fcb186d6080ac3a091eadff2d98fe\",\n \"lessThan\": \"e54beb9aed2a90dddf4c5d68fcfc9a01f3e40a61\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e5dfb815181fcb186d6080ac3a091eadff2d98fe\",\n \"lessThan\": \"6fde663f7321418996645ee602a473457640542f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e5dfb815181fcb186d6080ac3a091eadff2d98fe\",\n \"lessThan\": \"a039e54397c6a75b713b9ce7894a62e06956aa92\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/sched/cls_flow.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.25\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.25\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.290\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.234\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.177\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.125\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.72\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.10\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.13\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/9858f4afeb2e59506e714176bd3e135539a3eeec","https://git.kernel.org/stable/c/43658e4a5f2770ad94e93362885ff51c10cf3179","https://git.kernel.org/stable/c/a313d6e6d5f3a631cae5a241c392c28868aa5c5e","https://git.kernel.org/stable/c/2011749ca96460386844dfc7e0fde53ebee96f3c","https://git.kernel.org/stable/c/e54beb9aed2a90dddf4c5d68fcfc9a01f3e40a61","https://git.kernel.org/stable/c/6fde663f7321418996645ee602a473457640542f","https://git.kernel.org/stable/c/a039e54397c6a75b713b9ce7894a62e06956aa92"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21653","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21653","identifiers":["CVE-2025-21653"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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